Win32 Surfaces: Cairo: A Vector Graphics Library

## Win32 Surfaces Win32 Surfaces — Microsoft Windows surface support |

## Functions

cairo_surface_t * | cairo_win32_surface_create ()
cairo_surface_t * | cairo_win32_surface_create_with_dib ()
cairo_surface_t * | cairo_win32_surface_create_with_ddb ()
cairo_surface_t * | cairo_win32_surface_create_with_format ()
cairo_surface_t * | cairo_win32_printing_surface_create ()
HDC | cairo_win32_surface_get_dc ()
cairo_surface_t * | cairo_win32_surface_get_image ()

## Types and Values

#define | CAIRO_HAS_WIN32_SURFACE

## Description

The Microsoft Windows surface is used to render cairo graphics to Microsoft Windows windows, bitmaps, and printing device contexts.

The surface returned by `cairo_win32_printing_surface_create()` is of surface type `CAIRO_SURFACE_TYPE_WIN32_PRINTING` and is a multi-page vector surface type.

The surface returned by the other win32 constructors is of surface type `CAIRO_SURFACE_TYPE_WIN32` and is a raster surface type.

## Functions

### cairo_win32_surface_create ()

    cairo_surface_t *
    cairo_win32_surface_create (HDC hdc);

Creates a cairo surface that targets the given DC. The DC will be queried for its initial clip extents, and this will be used as the size of the cairo surface. The resulting surface will always be of format `CAIRO_FORMAT_RGB24`; should you need another surface format, you will need to create one through `cairo_win32_surface_create_with_format()` or `cairo_win32_surface_create_with_dib()`.

#### Parameters

hdc | the DC to create a surface for |

#### Returns

the newly created surface, NULL on failure

Since: 1.0

### cairo_win32_surface_create_with_dib ()

    cairo_surface_t *
    cairo_win32_surface_create_with_dib (cairo_format_t format,
                                         int width,
                                         int height);

Creates a device-independent-bitmap surface not associated with any particular existing surface or device context. The created bitmap will be uninitialized.

#### Parameters

format | format of pixels in the surface to create |
width | width of the surface, in pixels |
height | height of the surface, in pixels |

#### Returns

the newly created surface

Since: 1.2

### cairo_win32_surface_create_with_ddb ()

    cairo_surface_t *
    cairo_win32_surface_create_with_ddb (HDC hdc,
                                         cairo_format_t format,
                                         int width,
                                         int height);

Creates a device-dependent-bitmap surface not associated with any particular existing surface or device context. The created bitmap will be uninitialized.

#### Parameters

hdc | a DC compatible with the surface to create |
format | format of pixels in the surface to create |
width | width of the surface, in pixels |
height | height of the surface, in pixels |

#### Returns

the newly created surface

Since: 1.4

### cairo_win32_surface_create_with_format ()

    cairo_surface_t *
    cairo_win32_surface_create_with_format
                                   (HDC hdc,
                                    cairo_format_t format);

Creates a cairo surface that targets the given DC. The DC will be queried for its initial clip extents, and this will be used as the size of the cairo surface.

Supported formats are: `CAIRO_FORMAT_ARGB32` `CAIRO_FORMAT_RGB24`

Note: `format` only tells cairo how to draw on the surface, not what the format of the surface is. Namely, cairo does not (and cannot) check that `hdc` actually supports alpha-transparency.

#### Parameters

hdc | the DC to create a surface for |
format | format of pixels in the surface to create |

#### Returns

the newly created surface, NULL on failure

Since: 1.14

### cairo_win32_printing_surface_create ()

    cairo_surface_t *
    cairo_win32_printing_surface_create (HDC hdc);

Creates a cairo surface that targets the given DC. The DC will be queried for its initial clip extents, and this will be used as the size of the cairo surface. The DC should be a printing DC; antialiasing will be ignored, and GDI will be used as much as possible to draw to the surface.

The returned surface will be wrapped using the paginated surface to provide correct complex rendering behaviour; `cairo_surface_show_page()` and associated methods must be used for correct output.

#### Parameters

hdc | the DC to create a surface for |

#### Returns

the newly created surface

Since: 1.6

### cairo_win32_surface_get_dc ()

    HDC
    cairo_win32_surface_get_dc (cairo_surface_t *surface);

Returns the HDC associated with this surface, or `NULL` if none. Also returns `NULL` if the surface is not a win32 surface.

A call to `cairo_surface_flush()` is required before using the HDC to ensure that all pending drawing operations are finished and to restore any temporary modification cairo has made to its state. A call to `cairo_surface_mark_dirty()` is required after the state or the content of the HDC has been modified.

#### Parameters

surface | a cairo_surface_t |

#### Returns

HDC or `NULL` if no HDC available.

Since: 1.2

### cairo_win32_surface_get_image ()

    cairo_surface_t *
    cairo_win32_surface_get_image (cairo_surface_t *surface);

Returns a cairo_surface_t image surface that refers to the same bits as the DIB of the Win32 surface. If the passed-in win32 surface is not a DIB surface, `NULL` is returned.

#### Parameters

surface | a cairo_surface_t |

#### Returns

a cairo_surface_t (owned by the win32 cairo_surface_t), or `NULL` if the win32 surface is not a DIB.

Since: 1.4

## Types and Values

### CAIRO_HAS_WIN32_SURFACE

    #define CAIRO_HAS_WIN32_SURFACE 1

Defined if the Microsoft Windows surface backend is available. This macro can be used to conditionally compile backend-specific code.

Since: 1.0

## See Also

cairo_surface_t